They didn’t go too far with spacing, consistency is way up, generally everything feels like it’s using the same standard set of widgets.
It feels in a weird way just a little slow. I’m not sure why, I even thought maybe it’s my Chrome or something. I noticed hovering a list item had what felt like a small delay. Turns out it was just the animation they used to fade in/out. I think they messed that up (fade in should be near instant or else it feels laggy).
That said, as a UX specialized dev, I appreciate it overall. Don’t like Facebook or even use the app much, but the design and tech are better overall.
What they get wrong is making the background too bright, and often with a blue tinge. Not what I want in my dark mode, folks! Should never be brighter than #333.